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具有良好球化组织的60Si2Mn钢模具,热处理变形较小,而且可以获得良好的综合机械性能。但是,这种钢比较难于球化,用传统球化工艺,如缓冷及等温转变和反复加热退火,都未获得良好的球化组织。采用φ25×50mm试样,钢的成分(%)为:C～0.61、Si～1.50、Mn～0.84、S～0.01、P～0.032,进行球化退火工艺试验,找到比较好的球化退火工艺如下:(1)试样按0.7min/mm系数加热到850℃并保温后在油中淬火;(2)试样随炉加热到790°±5℃(Ac_3以上)保温25min,以110℃/h速度冷却到680℃(Ac_1以下),保温1小时后炉冷。
60Si2Mn steel die with a good spheroidization structure has less heat distortion and offers good overall mechanical properties. However, this kind of steel is more difficult to spheroidize. With the traditional spheroidizing process, such as slow cooling, isothermal transformation and repeated heating annealing, no good spheroidizing structure is obtained. The sample of φ25 × 50mm was used. The steel composition (%) was C ~ 0.61, Si ~ 1.50, Mn ~ 0.84, S ~ 0.01 and P ~ 0.032. The spheroidizing annealing test was carried out to find the better spheroidizing annealing process As follows: (1) The sample is heated to 850 ° C at a rate of 0.7 min / mm and is quenched in oil after holding; (2) The sample is heated to 790 ° ± 5 ° C (above Ac_3) for 25 min with an oven heated to 110 ° C / h speed cooling to 680 ℃ (Ac_1 below), holding furnace cooling after 1 hour.